Screening apparatus.



L. M. SHERIDAN.

SCREENING APPARATUS.

APPLICATION FILED MAY 31, 191?.

1,085,997. 7 v Eatented; Feb.3,1914.

2 SHEETS-SHEET l.

WITNESSES:

ATTORNEY.

L. M. SHERIDAN. SCREENING APPARATUS. APPLIOATION FILED MAY31, 1913.

ga ggg gw; Patented Feb. 3, 1914.

2 SHEETS-SHEET 2.

WTNESSES: LVVENTOR.

g Led/eN-S/z'mim I Q R ATTORNEY.

out of ore, like with a LESLIE MTSHERIDAN, OF ANACONDA, MONTANA.

. SCREENING APPARATUS.

Specification of Letters Patent.

Patented Feb." 3, 391%.

Application filed May 3]., 1913. Serial No. 771,052.

To all whom it may concern:

Be it known that I, Lnsun M. SHERIDAN, citizen of the United States, residing at Anaconda, in the count 1 of Deerlodge and State of Montana, have invented certain new and useful Improvements in Screening Apparatus, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof. i

My invention has relation to improvements. in screening apparatus; and it consists in the novel details of construction more fully set forth in the specification and pointed out in the claims.

In'the drawings, Figure l is a. vertical longitudinal section of theapparatus on the line 1-1 of Fig. 2; Fig. 2 is. a top plan thereof; Fig. 3 is a front end elevation, parts being broken 'away; Fig. 4 is a vertical cross-section on the line i-l of Fig. 2 and on the zig-zag line 4 L ofFig. 1; Fig. 5 is a section on the order ofFig. 1 with the I eccentrics thrown ninety degrees from their position as illustrated in 1, the positions of the screening bars being correspondiagrammatic the path described by a set of screening bars.

The invention herein is particularlydirected to apparatus for screening the fines coal, minerals, gravel, and the view of maintaining-a uniform feed of the oversizcd materialto any point of subsequent treatment, as for example to crushers, rolls, and concentrating Inachinery, the invention being admirably adapted for handling material which is ina wet, clayey orsticky condition.

A further object is to provide an appara-' ,tus which will positively advance the oversize to the discharge end of the machine; one which will allow the fines to work down through the mass to the screening surface; one which will not clog; 'one in which there will be no binding or crushing, or wedging action tending to crush the ore or stop the machine; one operating with a least amount of resistance; one susceptible of mechanical changes without a departure from the spirit or principle of the intention; and one possessing further and other advantages bet character of tei apparent from a detailed description of the invention which is as follows: -Referring to the drawings, T represents suitable timbers for the support of the apparatus, the same beingdisposed at a convenient point to carry a receiving hopper 1 as shown, said hopper being directly be neath the screening frames. The materialto be screened is discharged from a feed-hop per 2 onto an inclined plate 3 forming the upper boundary of one of the screening frames, the slope of plate being such that the material, assisted by the" vibration of the screening frame by which the plateis carried, is advanced rearward and downward onto the screening surface. This screening surface is composed of parallel bars 4, 5, respectively, pitching or inclining downwardly and rearwardly, one set of bars (4:) having a movementindependent of the adjacent set (5) as presently to be described. Tothe outer or extreme pair of bars i, 4., are fastened the sides 6, 6 and to the intermediate bars 4 and between the sides 6, 6, is secured the bottom rear discharge plate 7, the connection tontheba'rs' being effected by rivets I- (or equivalent mechanical manner) passed through the rear and bottom set of terminal lugs or ribs 17. carried byfthe sides of the bars. The parts 4, 6, 7, thus connected collectively form a rigid screening frame by which the upper front plate 3 is carried. The lower (rear) end of this frame is co'uled to a rod 8 through the medium of the si e rigid links 9:, 9, whose opposite ends are pivotally coupled to the sides 6, 6, and to the rod 8 respectively. The rod (or shaft) 8 is supported in bearings 10, 10, carried by the timbers T. The front and higher end of the said screening frame is provided with suitable bearings or hollow bosses 11, 1.1, which receive the eccentrics 12,12, carried by the shaft 13, said shaft being mounted in bearings 14, supported by the timbers T. The front ends oi the bars 4 areconnected to a tie rod 15 igwhich thus becomes a part of the screening said, being supported between the sides 6, 6, thereof) the ends of the bars being spaced properly apart by the the th'imble's or sleeves 16' dis need about the rod between the bars.

rame .atore- It wil ,be seen has the drawings (Figs- 1,

2) thatthe outside bars at, 4, are extended forward to embrace the eccentric-bearings or bosses 11, 11, and. that the centerbar a or that immediately over the central eccen 'tric-bearing 11 (to be presently referred posed of the bars previously referred to) and tie rods 17 and 18, the rod 17 passing through lugs a at the rear lower terminals of the bars, and the bar 18 passing through the front terminal legs I) of the bars disposed immediately on opposite sides of the center eccentric-bearing or boss 11, and through-the corresponding but shorter legs 5 of the remaining bars, both rods 17, 18, carrying spacing thimbles or sleeves '19 be tween the bars. The extension legs Z2, 6, directly support the center hollow boss or eccentriobearing 11 in which operates the center eccentric 12 disposed on the shaft 13, said eccentric thus serving as a support for the front upper end of tho complementary screening frame. The lower ends of the extreme or outer pair of bars 5 are provided, with rearward extensions 5 Whose ends are pivotally coupled to the upper ends of theintermediate links 20 freely oscillatable about the of the rod or shaft 8 and being shorter than the links Tihe cccentrics 12, 12, are set angularly apart, having substantially:opposite throws so that as one eccentric is down the other is up, and vice versa. 1

As seen from the drawings, the bars 4, 5, of the respective complementary screen ing frames, are parallel and spaced suitably apart, the sides of the bars 4- being provided with downwardly cross-sectionally tapering lugs or equivalent formations m,'the corresponding sides or faces of the bars 5 being provided with corresponding lugs or formations in, the lugs (or their equivalents) be ing in transverse alinenient and disposed in parallel rows (Fig. 2), there being sufiicicnt clearance between the free sides of the lugs and. the face of the adjacent bar to prevent binding and to allow perfect freedom of movement between the parts. The lower ends of thc bars 4, 5, are provided with elongated terminally beveled lugs or ribs 02, n, res 'icctively, those also tapering crosssectionally downward (Fig. 4:) so as to pro duce a downwardly flaring clearance between the lugs and bars, an arrangement similar to that prevailing in grate-bar constructions, to allow perfect freedom for the fine material to fall through between the bars. The presence of the lugs m, at, a, it, leaves suitable polygonal (square) openings 0 between the bars and lugs for the fines to pass through and be received by the hopper 1. The shaft 13 is provided with belt pulley P whereby rotation may be i iarted thereto.v from any suitable source of power (not shown).

In the present illustration the ore-sup porting faces of the lugs m, m, are shown quadrilateral and preferably square (Fi t 2) but it to be understood that I do not figuration of either lug or discharge opening. By changing the shape of the lug a corresponding shape in the opening 0 will necessarily result; that is obvious without actual illustration. The objectsonght of course, is to so proportion and space the lugs as to leave openings just large enough to allow the desired. size of screened mate rial or fines to pass through ii .e the hoppe l. Again, the links 9, 20, might be coupled to a shaft or rod overhead, in lieu ofa bot-- tom rod 8 as shown. In fact, many mechanical changes might be resorted to without in any wise departing from the principle or spirit of the invention.

The operation will. be readily understood from the foregoing, but is substantially as follows: It will be seen from the connections described that the main screenin frame, or that carrying the feed-plate 3 is irce to reciprocate longitudinally byrcascn of the connection of its lower end to iii 'insversc shaft 8 through the links 9, i t ing free to oscillate about shaft. So too is the coniplen; ing frame free to recii 'iroczrte v its connection. to the same shaft through the oscillating links 52f 20., The front, and relatively elevated ends of the respective screens are free to rise and fall and describe what is 1110. ,3. or less a circular motion iinparted to thcin by the eccentrics 12, 1:2, which, as stated, are set with approsiiinalcly opposite throws. When therefore, rotation imparted to the shaft 13 (in the direction of the arrow Fig. 1) it follows that the screening frames will have inn iarted to them a. bodily movement not materially unlike that of the connecting rod of'a locomotive engine, the forward ends partaking: in the present case, of a movement akin to elongated ellipse 5 (sec i'liagrannnatic iEh tration Fig. ll) whose terminals conform substantially to the are of a circle, the e 3onirig frame iisfislil'r'liilg' extreme l'KJSli'lOilc, It. 72.,

and a mean position 76, as shown in Fig. 6. Since, however, the eccentrics are sot to substantially opposite throws, -l. follows I that as one frame (With its screening bars) Wish to be limited to any particular conscreening frames, their respective bars 4, 5,

advanced rearward and downward by the l2, 12), the material tends'to pile up on -.tion) bythe push of thematerial behind it,

noaaeev ill the units of one set alternating with the of the coacting set, and the continuity of the spaces between adjacent units being broken by the side lugs or equivalent formations (m, m, a, a, or their equivalents) moves forward and upward, the complement-nry frame will move rearward and downward upward and downward having special reference of course, to the front ends coupled to the eccentrics) the rear lower ends of the frames having imparted to them in the main a longitudinal reciprocating movement attended with very little rise and fall, such rise and fall being determined by the character of arcs described by the upper ends of the links 9 and 20 respectively. I

Figs. 1 and 5 show the relation of the screening frames for a rotation of ninety degrees of the eccentrics, and what their relation is for the balance of the three hundred and sixty degrees may be readily imagined without the assistance of further illustration. In these opposite, simultaneous, but independent reciprocations of the same into a series of openings for the discharge of the lines, said lugs serving as means for lifting the oversize out of th" openings, and advancing it toward the discharge end of the screen.

Having described my invention what I. Claim is: 3

1. In a screening apparatus, a screen having a screening surface composed of independent sets of parallel inclined bars, the bars of one set alternat'ng with those of the coacting set and spaced apart, means at the elevated ends of the bars for imparting to the bars at said ends a. substantially circular movement, the movements of one set being opposite to that of the coacting set, links of unequal lengths atthe opposite ends for pivotally connecting said ends to a common fixedlaxis of oscillation, suitable forn1ations on the bars extending across the spaces between the bars, and dividing'the spaces into a series of openings, and means for delivering thematerial to be screened to the upper end of the screening surface.

In a screening apparatus, a screen having a screening surface composed of independent sets of parallel inclined bars, the bars of one set alternating with those of the eoacting set and spaced apart, eccentrics at the elevated ends of the bars, set to throws will play longitudinally in opposite directions, forming as they do, componentparts of the frames, and during these reciprocations the fines are agitated and readily work down through the mass resting on the screen ing surface into the openings 0 whence they drop into the hopper 1. At the same time the oversize, or the material too large to pass through the holes 0 of the screen is automatically lifted out of the holes and lugs m, m, carried by the bars. Thus the holes 0 are kept open and free for the passage ,of .the fines, the oversize advancing until it slides off the beveled. ends of the lugs or ribs 11', 72/, onto the plate or pan 7. Owing to the change of the form ofthemotion imparted to the pan 7 (its movement being substantially a reciprocating one as compared to the rotary or elliptical mh'vement f the front ends of the screening frames directly actuated by the eccentrics disposed angularly apart for simultaneously and independently actuating the respective sets of bars in opposed directions, a trans versely disposed rod or shaft, links of unequal lengths pivotally connecting the lower ends of the bars of the respective sets to said rod, formations on the sides of the respective bars disposed in transverse alinem'ent across. the ,screening surface and extending across the spaces between the bars whereby said spaces are divided into a se-' ries of discharge openings for the fines, and means for delivering the material to be screened onto the elevated end of the screensaid pan, but is forced off from the rear end of the screen (the screen contemplating the complementary screening frames wherever the term is used in the present descripthe vibratory motion of the pan causing a tending across the spaces and dividing the 70 uniform flow of the oversiz e off the end (if ing surface.

the screen, such uniform flow being 'emi- 3. A screening apparatus comprising a I nently desirable in feeding crushers, rolls frame composed of a series of inclined bars and concentratin -machinery enerally. The spaced apart, side members secured to the disposition and s lape of the ugs m, m, a, outer bars of the series, a discharge plate sen, is such as to eliminate all binding, wedgcured to the'ba-rs at the lower end of the ing or crushing of the ore (or other ma frame, means at the upper end for receiving terial) between the moving parts of the the material to be screened, means for semachine, and hence the danger of the macuring the upper ends of the bars, a second chine coming to astop does not arise. frame comprising a series of coacting bars Generically stated, the screen may be said connected at opposite ends and alternating to have a screening surface composed of diswith the bars of the first frame and spaced tinct sets or series of parallelly disposed therefrom, extensions leading frbm-the lower coaeting bars or units suitably spaced apart, ends of a pair of bars of the second frame beneath the discharge plate of the first i for subdividing the spaces between the bars 10 frame, a fixed, transversely disposed rod into suitable discharge openings for the contiguous'to the discharge end of the first fines.

frame, independent links of unequal lengths In testimony whereof I affix my signature,

5 pivotally connecting the rear extensions of in presence of two Witnesses.

the seeond frame and the discharge end of i LESLIE M. SHERIDAN. the first frame to said rod, means for siinul- I Witnesses: taneously actuating in opposite directions F. N. PECKMAN,

the elevated ends of the frames, and means 1 Mrs. F. N. Hnemmn. 

